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Kilometers to miles converter

Convert kilometers to miles and back, with a chart of common distances (5K, half marathon, marathon). 1 mile = 1.609344 km. Free and instant.

  • Free
  • No sign-up
  • No file uploaded
  • Windows, Mac, Android, iPhone

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About this tool

Miles measure road distances, signs, car odometers and running races in several countries. Type a distance in kilometers to get it in miles, or switch the direction in one click.

When to use it

Running and cycling

A 10K is 6.2 miles and a marathon 26.2 miles: compare your times with training plans in miles.

Road trips

A distance or limit shown in miles becomes readable in kilometers: 60 miles is 96.6 km.

Aviation and sailing

The full list also shows nautical miles, used at sea and in the air.

How to use

  1. Type a distance in kilometers.
  2. Read the result in miles.
  3. Click ⇄ to convert miles to kilometers.

How it works

The international mile is defined as exactly 1,609.344 meters. The tool divides the distance in kilometers by 1.609344 and rounds the display to avoid floating-point errors.

The chart of common distances and the list of every length unit (meters, feet, yards, nautical miles…) update as you type, in your browser.

Tips for best results

  • For a quick estimate, multiply kilometers by 0.6.
  • The other way, multiply miles by 1.6.
  • A nautical mile (1.852 km) is longer than a statute mile.
  • For speeds the ratio is the same: km/h × 0.621 = mph.

Common problems and fixes

The result doesn't match a nautical chart

Nautical charts use nautical miles: read that line in the unit list.

My value isn't accepted

Type only the number, without “km”. Commas and points both work.

I want miles to kilometers

Click the ⇄ button: the direction and the chart switch.

Frequently asked questions

How many kilometers are in a mile?

Exactly 1.609344 km. This is the international statute mile, not to be confused with the nautical mile (1.852 km).

How do I convert km to miles in my head?

Multiply by 0.6 for an estimate, or multiply by 5 and divide by 8: 80 km is about 50 miles (49.7 exactly).

How many miles is a marathon?

A 42.195 km marathon is 26.2 miles, and a half marathon is 13.1 miles.

What about km/h to mph?

The same ratio applies: 100 km/h is 62.1 mph. The full unit converter also handles speeds.

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Still stuck?

Ask on the forum: the category, the tool, your device sheet and the test result will be filled in for you.